This classic chemistry demonstration is a huge hit with kids of all ages. It looks just like a giant tube of toothpaste being squished. Be prepared for very excited students who want to see the demonstration more than once!

This classic mathematical trick always gives the same result of 1089, but can be very surprising for the uninitiated. Use it to teach algebra, as part of a critical thinking unit on the paranormal and 'psychics' or just for fun.